Design for a cap



FIG. 1 is a front elevational view of a cap showing our new design;

FIG. 2 is a side elevational view thereof, the opposite side is a mirror image;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a front perspective view thereof.

The broken line showing of the face shown on the cap is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a cap, as shown and described. 